Compound reconstruction technology of carbonate fracture pore-cave reservoir in TP area

TP area is one of the main oil-producing blocks of ordovician carbonate reservoir in Tahe oilfield.Under the condition of high temperature and high closure pressure,the penetration distance of acid corrosion crack caused by conventional acid pressure was limited and prone to closure,and showed a rapid decline characteristic after the production.Through experimental research,hydraulic sand fracturing+acid compound modification technology was developed.In early stage,by using gel carrying sand to improve the artificial fracture distal flow capacity,while in late stage,by using acid etching to improve flow capacity of near-wellbore and transform the scope,overall improving artificial fracture conductivity and retention rate.The technology was implemented 6 well times in TP area,with a yield of 83.3%and accumulated oil of3.76×104t,which indicates stronger adaptability in low grade pore-cave fracture carbonate reservoir.